"outfront" tonight, obama vows he'll get the killers. today the president spent 24 minutes of his half-hour speech to the united nations talking about libya, the middle east and ambassador chris stevens. the speech, which was seen by american voters and viewers around the world, mentioned stevens 12 times. as the president paid tribute to him right from the start. >> chris stevens loved his work. he took pride in the country he served, and he saw dignity in the people that he met. and two weeks ago, he traveled to benghazi to review plans to establish a new cultural center and modernize a hospital. that's when america's compound came under attack. >> that's the first we learned about exactly what stevens was doing in benghazi, a city the u.s. had been warned was not safe. and the president continued in his speech vowing to find the killers. >> the attacks on the civilians in benghazi were attacks on american. we are grateful for the assistance we received from the libyan government, and from the libyan people. there should be no doubt th